In modern well known approaches, "agile" has emerged as the leading approach in software industry for the development of the software projects. With different innovative shapes agile is applicable for handling the issues regarding cost, time, continuously change environment and requirements. Agile has proved to be successful in the small and medium size project, however, it have several limitations when applied on large size projects. The aim of this study is to analyze agile approaches in detail, finding its success stories in small and medium size projects and highlighting its limitations for large size projects .This study will identify the current research problem of the agile scalability for large size projects by giving a detail literature review of the identified problem, and will synthesize the existing work for covering the identified problem in the agile scalability. Based on it, we can judge the limitations of agile scalability for large size projects and can think of some remedial approach for overcoming these limitations in future.